Add POSIX Pipe feature to VxWorks

VxWorks has POSIX pipe2 functions, but doesn't pass threadsafe-cloexec
because it doesn't have threadsafe-cloexec dup3. By default on VxWorks
POSIX pipes are used, but now it's possible to switch to PipeDrv
pipes using "configure -feature-vxpipedrv ...".
dup3 and accept4 test are now separated from threadsafe-cloexec test.

Task-number: QTBUG-132889
Pick-to: 6.8 6.9
Change-Id: I9e4514e2795917e8f3685a1760ea82a0022e9ca2
Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/configure.cmake

@@ -132,6 +132,46 @@ int pipes[2];
 }
 ")
 
+# dup3
+qt_config_compile_test(dup3
+    LABEL "dup3"
+    CODE
+"#define _GNU_SOURCE 1
+#include <fcntl.h>
+#include <unistd.h>
+
+int main(void)
+{
+    /* BEGIN TEST: */
+(void) dup3(0, 3, O_CLOEXEC);
+    /* END TEST: */
+    return 0;
+}
+")
+
+# acccept4
+qt_config_compile_test(accept4
+    LABEL "accept4"
+    CODE
+"#define _GNU_SOURCE 1
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+int main(void)
+{
+    /* BEGIN TEST: */
+#if defined(__NetBSD__)
+(void) paccept(0, 0, 0, NULL, SOCK_CLOEXEC | SOCK_NONBLOCK);
+#else
+(void) accept4(0, 0, 0, SOCK_CLOEXEC | SOCK_NONBLOCK);
+#endif
+    /* END TEST: */
+    return 0;
+}
+")
+
 # copy_file_range
 qt_config_compile_test(copy_file_range
     LABEL "copy_file_range()"
@@ -866,6 +906,19 @@ qt_feature("threadsafe-cloexec"
 )
 qt_feature_definition("threadsafe-cloexec" "QT_THREADSAFE_CLOEXEC" VALUE "1")
 qt_feature_config("threadsafe-cloexec" QMAKE_PUBLIC_QT_CONFIG)
+qt_feature("dup3" PRIVATE
+    LABEL "dup3 support"
+    CONDITION TEST_dup3
+)
+qt_feature("accept4" PRIVATE
+    LABEL "accept4 support"
+    CONDITION TEST_accept4
+)
+qt_feature("vxpipedrv" PRIVATE
+    LABEL "Use pipedrv pipes on VxWorks"
+    AUTODETECT OFF
+    CONDITION VXWORKS
+)
 qt_feature("regularexpression" PUBLIC
     SECTION "Kernel"
     LABEL "QRegularExpression"

src/corelib/global/qconfig-bootstrapped.h

@@ -52,6 +52,7 @@
 #define QT_NO_DATASTREAM
 #define QT_FEATURE_datestring 1
 #define QT_FEATURE_datetimeparser -1
+#define QT_FEATURE_dup3 -1
 #define QT_FEATURE_easingcurve -1
 #define QT_FEATURE_etw -1
 #define QT_FEATURE_futimens -1

src/corelib/kernel/qcore_unix_p.h

@@ -270,7 +270,6 @@ static inline int qt_safe_open(const char *pathname, int flags, mode_t mode = 07
 #undef QT_OPEN
 #define QT_OPEN         qt_safe_open
 
-#ifndef Q_OS_VXWORKS // no POSIX pipes in VxWorks
 // don't call ::pipe
 // call qt_safe_pipe
 static inline int qt_safe_pipe(int pipefd[2], int flags = 0)
@@ -299,8 +298,6 @@ static inline int qt_safe_pipe(int pipefd[2], int flags = 0)
 #endif
 }
 
-#endif // Q_OS_VXWORKS
-
 // don't call dup or fcntl(F_DUPFD)
 static inline int qt_safe_dup(int oldfd, int atleast = 0, int flags = FD_CLOEXEC)
 {
@@ -328,7 +325,7 @@ static inline int qt_safe_dup2(int oldfd, int newfd, int flags = FD_CLOEXEC)
     Q_ASSERT(flags == FD_CLOEXEC || flags == 0);
 
     int ret;
-#ifdef QT_THREADSAFE_CLOEXEC
+#if QT_CONFIG(dup3)
     // use dup3
     QT_EINTR_LOOP(ret, ::dup3(oldfd, newfd, flags ? O_CLOEXEC : 0));
     return ret;

src/corelib/kernel/qeventdispatcher_unix.cpp

@@ -27,8 +27,16 @@ static constexpr bool UsingEventfd = true;
 static constexpr bool UsingEventfd = false;
 #endif
 
-#if defined(Q_OS_VXWORKS)
+#if defined(Q_OS_VXWORKS) && QT_CONFIG(vxpipedrv)
+#  include "qbytearray.h"
+#  include "qdatetime.h"
+#  include "qdir.h" // to get application name
+#  include "qrandom.h"
 #  include <pipeDrv.h>
+#  include <selectLib.h>
+#  include <taskLib.h>
+#  include <rtpLib.h>
+#  include <sysLib.h>
 #endif
 
 using namespace std::chrono;
@@ -62,12 +70,12 @@ QThreadPipe::~QThreadPipe()
     if (!UsingEventfd && fds[1] >= 0)
         close(fds[1]);
 
-#if defined(Q_OS_VXWORKS)
+#if defined(Q_OS_VXWORKS) && QT_CONFIG(vxpipedrv)
     pipeDevDelete(name, true);
 #endif
 }
 
-#if defined(Q_OS_VXWORKS)
+#if defined(Q_OS_VXWORKS) && QT_CONFIG(vxpipedrv)
 static void initThreadPipeFD(int fd)
 {
     int ret = fcntl(fd, F_SETFD, FD_CLOEXEC);
@@ -88,20 +96,32 @@ bool QThreadPipe::init()
 {
 #if defined(Q_OS_WASM)
     // do nothing.
-#elif defined(Q_OS_VXWORKS)
+#elif defined(Q_OS_VXWORKS) && QT_CONFIG(vxpipedrv)
-    std::snprintf(name, sizeof(name), "/pipe/qt_%08x", int(taskIdSelf()));
+    RTP_DESC rtpStruct;
+    rtpInfoGet((RTP_ID)NULL, &rtpStruct);
+
+    QByteArray pipeName("/pipe/qevloop_");
+    QByteArray path(rtpStruct.pathName);
+    pipeName.append(path.mid(path.lastIndexOf(QDir::separator().toLatin1())+1, path.size()));
+    pipeName.append("_");
+    pipeName.append(QByteArray::number((uint)rtpStruct.entrAddr, 16));
+    pipeName.append("_");
+    pipeName.append(QByteArray::number((uint)QThread::currentThreadId(), 16));
+    pipeName.append("_");
+    QRandomGenerator rg(QTime::currentTime().msecsSinceStartOfDay());
+    pipeName.append(QByteArray::number(rg.generate()));
 
     // make sure there is no pipe with this name
-    pipeDevDelete(name, true);
+    pipeDevDelete(pipeName, true);
 
     // create the pipe
-    if (pipeDevCreate(name, 128 /*maxMsg*/, 1 /*maxLength*/) != OK) {
+    if (pipeDevCreate(pipeName, 128 /*maxMsg*/, 1 /*maxLength*/) != OK) {
-        perror("QThreadPipe: Unable to create thread pipe device");
+        qCritical("QThreadPipe: Unable to create thread pipe device %s : %s", name, std::strerror(errno));
         return false;
     }
 
-    if ((fds[0] = open(name, O_RDWR, 0)) < 0) {
+    if ((fds[0] = open(pipeName, O_RDWR, 0)) < 0) {
-        perror("QThreadPipe: Unable to open pipe device");
+        qCritical("QThreadPipe: Unable to open pipe device %s : %s", name, std::strerror(errno));
         return false;
     }
 
@@ -150,7 +170,7 @@ int QThreadPipe::check(const pollfd &pfd)
     if (readyread) {
         // consume the data on the thread pipe so that
         // poll doesn't immediately return next time
-#if defined(Q_OS_VXWORKS)
+#if defined(Q_OS_VXWORKS) && QT_CONFIG(vxpipedrv)
         ::read(fds[0], c, sizeof(c));
         ::ioctl(fds[0], FIOFLUSH, 0);
 #else

src/network/socket/qnet_unix_p.h

@@ -73,7 +73,7 @@ static inline int qt_safe_accept(int s, struct sockaddr *addr, QT_SOCKLEN_T *add
     Q_ASSERT((flags & ~O_NONBLOCK) == 0);
 
     int fd;
-#ifdef QT_THREADSAFE_CLOEXEC
+#if QT_CONFIG(accept4)
     // use accept4
     int sockflags = SOCK_CLOEXEC;
     if (flags & O_NONBLOCK)